Trial to Evaluate the Safety and Immunogenicity of a Placental Malaria Vaccine Candidate (PRIMVAC ) in Healthy Adults (PRIMALVAC)

Verified January 2016 by Institut National de la Santé Et de la Recherche Médicale, France

Sponsor:

Institut National de la Santé Et de la Recherche Médicale, France

ClinicalTrials.gov Identifier:

NCT02658253

First Posted: January 18, 2016

Last Update Posted: March 24, 2016

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The primary objective of the study is to evaluate the safety of 3 different dosages (20µg - 50µg and 100µg) of a placental malaria vaccine candidate (PRIMVAC vaccine) adjuvanted either with Alhydrogel® or GLA-SE, and administered at D0, D28 and D56 in healthy European and Burkinabe adults.

The safety and the tolerability of the vaccine will be assessed on the rate of solicited and unsolicited events/reactions The safety profile will included local and systemic reactions/events as well as the biological safety, based on a clinically significant change of the baseline value of the main biological criteria

The level (g/l) of the isotypic subtypes (IgG1, IgG2, IgG3, IgG4) between D0 and the post-vaccination time point M3

Cellular immune responses to the vaccine antigen by Elispot [ Time Frame: 63 days ]

The median number of spots by ELISpot assay, allowing the counting of IL5 and IFNg secreting cells following an ex-vivo stimulation of PBMC with the vaccine antigen at V0, and 7 days post-dose 1 and 3 (D0- D7 and M2+7D)

Cellular immune responses to the vaccine antigen by FACS [ Time Frame: 63 days ]

CD19, IgD, CD27, CD38, CD24 and CD43 B lymphocytes subpopulations will be isolated from PBMC at D0 and M2+7D. The data will be expressed for each phenotype as the median percentage of subpopulations among total CD19 B lymphocytes

Other Outcome Measures:

Quality of the humoral immune responses [ Time Frame: 3 months ]

Will be assessed by measuring the capability of the specific vaccine antigen plasma IgGs to:

Cross-react with different VAR2CSA variants expressed on the surface of erythrocytes parasitized by various strains of Plasmodium falciparum by flow cytometry.

Inhibit interactions between parasitized erythrocytes expressing different VAR2CSA variants and Chondroitin Sulfate A in static and flow conditions

Promote opsonic phagocytosis of parasitized erythrocytes with various strains of Plasmodium falciparum expressing different VAR2CSA variants, using the THP1 cell line. Ingestion of fluorescently labeled parasitized erythrocytes by THP1 cells will be assessed by flow cytometry.

Quality of the cellular immune response by the Multiplex technology [ Time Frame: 63 days ]

Will be assessed by measuring the quantitation of a large panel of cytokines in ELISpot supernatants will be performed at D0- D7 and M2+7D. The difference of the cytokines concentrations (expressed as MFI) between the pre-vaccination samples and the samples collected at D7 and M2+7D will be calculated.

Primary objective is to evaluate the safety of 3 different dosages (20µg - 50µg and 100µg) of the PRIMVAC vaccine adjuvanted either with Alhydrogel® or GLA-SE, and administered at D0, D28 and D56 in healthy European and Burkinabe adults.

Secondary objectives are to assess:

the humoral immune response to the PRIMVAC vaccine antigen (VAR2CSA) by measuring the variation in the level of total IgG and the level of the isotypic subtypes capable of recognizing the native antigen.

the cellular immune response by measuring:

the number of T cell secreting IL5 and IFNg following an ex-vivo stimulation with the vaccine antigen

the B lymphocyte phenotypes isolated from PBMC

Exploratory objectives are:

To explore the quality of the humoral immune response by the measure of the capability of the antibodies specific to the vaccine antigen to:

Cross-react with different VAR2CSA variants expressed on the surface of erythrocytes infected by various strains of Plasmodium falciparum,

Promote opsonic phagocytosis of parasitized erythrocytes with various strains of Plasmodium falciparum expressing different VAR2CSA variants

To explore the quality of the cellular immune response induced by the vaccine antigen by the quantitation of a large panel of cytokines in the ELISpot supernatants.

Eligibility

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Ages Eligible for Study:

18 Years to 35 Years (Adult)

Sexes Eligible for Study:

Female

Accepts Healthy Volunteers:

Yes

Criteria

Inclusion criteria (FRANCE):

Written informed consent (must be obtained prior initiation of any study related intervention)

Female of age ≥18 years to ≤35 years

Healthy as a result of review of medical history and/or clinical examination at the time of screening and clinical judgment of the investigator

Available for the duration of the trial (15 months)

Willingness to use reliable contraceptive methods such as: birth control pills or birth control patches or vaginal ring, diaphragm, IUD (intrauterine device), condom, progestin implant or injection, or surgical sterilization (hysterectomy, bilateral oophorectomy, tubal ligation) prior to enrollment at V0 and up to 4 weeks after last vaccination (V6)

Volunteer reachable by phone during the entire study duration

Individuals affiliated to a social security regimen

Volunteer registered in the French Health ministry computerized file and authorized to participate in a clinical trial

Exclusion criteria (FRANCE):

Pregnancy ongoing as determined by a positive blood test or breastfeeding or lactation.

Intention to become pregnant during the trial

Volunteers who are not able to understand and to follow all required study procedures for the whole period of the study in the opinion of the investigator.

Volunteers with history of any illness that, in the opinion of the investigator, might interfere with the results of the study or pose additional risk to the subjects due to participation in the study.

Volunteers participating in any clinical trial with another investigational product 28 days prior to first study visit or intent to participate in another clinical study at any time during the conduct of this study.

History of psychiatric condition that may affect participation in the study (i.e. depression, anti-depressant treatment).

Prior receipt of an investigational malaria vaccine or any other investigational vaccine likely to impact on interpretation of the study data based on investigator's judgment.

Any history of malaria infection.

Travel to a malaria endemic region during the study period or within the six months preceding enrolment in the study.

Volunteer has had medical, occupational, or family problems as a result of alcohol or illicit drug use during the past 12 months.

History of allergic disease or reactions likely to be exacerbated by any component of the vaccine.

History of a serious adverse reaction to any vaccine, including Guillain-Barre Syndrome.

Administration or planned administration of a vaccine or gammaglobulin not foreseen by the clinical trial protocol within 30 days prior to the first immunization and up to 4 weeks after the last immunization.

Volunteers with a known bleeding diathesis, or any condition that may be associated with a prolonged bleeding time.

Administration of immunoglobulins and/or any blood products within the three months preceding the inclusion.

Symptoms, physical signs or laboratory values suggestive of systemic disorders, including infectious renal, hepatic, cardiovascular, pulmonary, cutaneous, immunodeficiency, psychiatric and other conditions, which could interfere with the interpretation of the trial results or compromise the health of the volunteers.

Volunteer under guardianship or legal incapacitation.

Inclusion criteria (BURKINA FASO):

Written informed consent (must be obtained prior initiation of any study related intervention)

Nulligest Female of age ≥18 years to ≤35 years

Healthy as a result of review of medical history and/or clinical examination at the time of screening and clinical judgment of the investigator

Available for the duration of the trial (15 months)

Willingness to use reliable contraceptive methods such as: birth control pills or birth control patches or vaginal ring, diaphragm, IUD (intrauterine device), condom, progestin implant or injection, or surgical sterilization (hysterectomy, bilateral oophorectomy, tubal ligation) prior to enrollment at V0 and up to 4 weeks after last vaccination (V6)

Exclusion criteria (BURKINA FASO):

Pregnancy ongoing as determined by a positive urinary test

Intention to become pregnant during the trial

Volunteers who are not able to understand and to follow all required study procedures for the whole period of the study in the opinion of the investigator.

Volunteers with history of any illness that, in the opinion of the investigator, might interfere with the results of the study or pose additional risk to the subjects due to participation in the study.

Volunteers participating in any clinical trial with another investigational product 28 days prior to first study visit or intent to participate in another clinical study at any time during the conduct of this study.

History of psychiatric condition that may affect participation in the study (i.e. depression, anti-depressant treatment).

Prior receipt of an investigational malaria vaccine or any other investigational vaccine likely to impact on interpretation of the trial data, based on investigator's judgment.

Volunteer has had medical, occupational, or family problems as a result of alcohol or illicit drug use during the past 12 months.

History of allergic disease or reactions likely to be exacerbated by any component of the vaccine.

History of a serious adverse reaction to any vaccine, including Guillain-Barre syndrome.

Administration or planned administration of a vaccine or gammaglobulin not foreseen by the clinical trial protocol within 30 days prior to the first immunization and up to 4 weeks after the last immunization.

Volunteers with a known bleeding diathesis, or any condition that may be associated with a prolonged bleeding time.

Administration of immunoglobulins and/or any blood products within the three months preceding the inclusion.

Symptoms, physical signs or laboratory values suggestive of systemic disorders, including renal, hepatic, cardiovascular, pulmonary, cutaneous, immunodeficiency, psychiatric and other conditions, which could interfere with the interpretation of the trial results or compromise the health of the volunteers.

Volunteer under guardianship or legal incapacitation.

Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02658253